Unfortunately, sending cipher data via HF has to deal with dropped bits,
while dropped bits don't affect speech that much, even 1 bit will make your
whole RC4 transmission junk. To add to your simulation command line, you
need to modulo add-in some noise bits, and then on receive have a modulo
un-noise algorithm :-)
I was playing with RC4 to send digital voice, and the only thing I came up
with was a header rather than a pilot carrier. So the modem syncs to the
header, and the header allows for packetizing the voice data.
https://github.com/hamradiojava/jRC4
The idea being a fixed open key though, and just using the scrambling for
waveform improvement.
I think since vocoders are already considered military weapons, that maybe
you don't want to push your authorization for use too much. Then too, even
the light algorithm I am playing with is patented. Going commercial is
messy.
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